Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 41 for “"Dioecious"”.
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Dioecious Plants: Evolution And Sex Ratio And Asepen Decline
<p>Although dioecious species are rare in nature, the sexual system appears in a diverse number of families and across all life forms and global locations. We looked at the population dynamics of natural populations to determine why many dioecious populations display biased sex ratios. We also …
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Rodents and Restionaceae : sex-specific plant-animal interactions in dioecious plants
… plant canopy structures between the sexes of the dioecious Cannomois congesta (Restionaceae) were found to be the result of the destructive pre-dispersal seed predation methods used by the four-striped grass mouse (Rhabdomys). Mature, reproductive culms on female plants were felled down (mid way …
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Understanding gender determination in dioecious Amaranthus weeds palmer amaranth (Amaranthus palmeri) and waterhemp (Amaranthus tuberculatus)
… the biology beneath the sex determination of dioecious weeds. Common waterhemp (Amaranthus tuberculatus (Moq.) Sauer var. rudis (Sauer) Costea and Tardif) and Palmer amaranth (Amaranthus palmeri S. Watson) are troublesome weeds of row-crop production in the United States. Their dioecious …
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Chemical reversion of sex expression in dioecious cucumber (Cucumis sativus L.) with ethephon and a benzothiadiazole
Thesis (M.S.)--Michigan State University. Dept. of Horticulture, 1972
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Intraspecific competition in Leucadendron xanthoconus (O.Knutze) K. Shun
Sexual dimorphism, characteristic of a number of dioecious genera has inspired workers to generate hypotheses as regards intersexual and intrasexual competition. The Proteaceae genus Leucadendron is an example. In the Highlands State forest near Grabouw (Cape Province, South Africa) a number of …
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The relationship of sexual dimorphism and differential predation to sex ratio in Leptochelia dubia (Crustacea: Tanaidacea)
Leptochelia dubia is a dioecious tube-building tanais, which broods its young and exhibits marked sexual dimorphism. The species is widely distributed in the Pacific, Atlantic, Mediterranean and Indian Oceans, but to date there are no published accounts of its ecology. L. dubia is one of the most …
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Dissecting phenotypic inheritance of very-long-chain fatty acid inhibitor resistance in waterhemp (Amaranthus tuberculatus) using a novel greenhouse assay: 'PRIM'
… compounded with additional variability in the dioecious species, waterhemp [Amaranthus tuberculatus (Moq.) Sauer]. The use of a single (one male × one female) cross provides a more controlled plant breeding environment, which is important when breeding a dioecious weed species whereby maternal …
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Characterization of the hermaphroditic reproductive system and sexual development in the planarian Schmidtea mediterranea
… expression of dmd-1 is retained in a derived, dioecious flatworm, Schistosoma mansoni. The male-specific expression of dmd-1 in both the hermaphroditic S. mediterranea and dioecious S. mansoni suggest one means by which modulation of sex-specific pathways can drive the transition from …
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The Ecology of Sexual and Apomictic Reproduction in Antennaria Parlinii Gaertner (Apomixis, Plant Breeding Systems, Evolution)
… occurs in plants that are either sexual and dioecious or apomictic. Studies of seedlings and ramet production by adult plants in natural populations documented differences in survivorship and allocation between sexual and apomictic plants. Populations of sexual and apomictic plants also …
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Sexual dimorphism, resource partitioning and intraspecific aggression in Caprella californica Stimpson
… Caprella californica Stimpson. ~- californica is dioecious and has marked sexual dimorphism in both its size and secondary sex characteristics. It is found from San Diego to the South China Sea (Laubitz, 1970), and is the dominant caprellid in the Zostera marina beds of the local bays and is a …
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Variation in Thamnocortus insignis - genetically and environmentally plastic?
… results support the predicted results for dioecious wind-pollinated species such as T. insignis.
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Consideration of biotype to improve invasive species management
… but lost more mass during desiccation than dioecious hydrilla; suggesting one biotype may have a competitive advantage for successful invasions. Management of other nonindigenous invasive species may also benefit from incorporation of biotype, or other subspecies biological traits into …
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Consideration of biotype to improve invasive species management
… but lost more mass during desiccation than dioecious hydrilla; suggesting one biotype may have a competitive advantage for successful invasions. Management of other nonindigenous invasive species may also benefit from incorporation of biotype, or other subspecies biological traits into …
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Sexual dimorphism in the genus Leucadendron : Morphology and plant hydraulics
… Cape Proteaceae family, is made up of over 70 dioecious species that vary in their degree of sexual dimorphism. Males are generally more highly ramified (branched) with smaller leaves compared to corresponding females. It has been hypothesised that sexual dimorphism in Leucadendrons is linked …
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OOGENESIS IN TUBULARIA LARYNX AND TUBULARIA INDIVISA (HYDROZOA, ATHECATA)
… hermaphroditic while T. indivisa is strictly dioecious.</p>
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Genomic dissection of structural variations and evolution forces of the sex chromosomes in spinach (spinacia oleracea)
… We selected garden spinach, an annual leafy dioecious vegetable with a pair of nascent sex chromosomes to study sex chromosome evolution. Based on a theory of sex chromosome evolution, sex chromosomes evolved from autosomes by genetic mutations relate to the female and male reproductive organ …
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El papel facilitador o inhibidor de Pinus Pinea L. Sobre especies autóctonas de matorral mediterráneo
… between O. lanceolata, a hemiparasitic dioecious shrub and P. pinea. A thin needle layer could improve seed germination and seedling performance of shrub species due to the maintenance of a safe site and supplying some nutrients. These same needles may retard decomposition processes, but …
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Transcriptome characterisation of the intra-mammalian stage of male and female Schistosoma mansoni
… disability-adjusted life years. Schistosomes are dioecious and male and female worms find one another and pair in the blood vessels of the host’s liver. This sets in motion a unique feature of schistosome biology, the pairing-dependent sexual maturation of the female worms. Over the course of the …
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Antiproliferative activities of Euphorbia bicolor (euphorbiaceae) and Maclura pomifera (moraceae) extracts on estrogen receptor-positive and triple-negative breast cancer cell lines
… in breast cancer cell lines. Maclura pomifera, a dioecious tree native to the south-central USA, showed significant antiproliferative effects in estrogen receptor positive MCF-7 and T47D breast cancer cells. Extracts of both male and female branches and leaves (500 µg/mL) reduced cancer cell …
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